Refactor mpybit and add msg_composer dropdown

Author: shekhar-cis

src/bitmessagekivy/kv/msg_composer.kv

@@ -38,6 +38,7 @@
                         id: btn
                         background_color: app.theme_cls.primary_dark
                         values: app.identity_list
+                        on_text: root.auto_fill_fromaddr() if self.text != 'Select' else ''
                         option_cls: Factory.get("ComposerSpinnerOption")
                         background_normal: ''
                         background_color: app.theme_cls.primary_color

src/bitmessagekivy/main.kv

@@ -292,6 +292,7 @@ MDNavigationLayout:
         elevation_normal: 8
         md_bg_color: [0.941, 0, 0,1]
         on_press: app.root.ids.scr_mngr.current = 'create'
+        on_press: app.clear_composer()
 
 
 <SwipeToDeleteItem>:

src/bitmessagekivy/mpybit.py

@@ -309,6 +309,28 @@ def on_request_close(self, *args):  # pylint: disable=no-self-use
         AppClosingPopup().open()
         return True
 
+    def clear_composer(self):
+        """If slow down, the new composer edit screen"""
+        self.set_navbar_for_composer()
+        composer_obj = self.root.ids.id_create.children[1].ids
+        composer_obj.ti.text = ''
+        composer_obj.composer_dropdown.text = 'Select'
+        composer_obj.txt_input.text = ''
+        composer_obj.subject.text = ''
+        composer_obj.body.text = ''
+        self.kivy_state_obj.in_composer = True
+        self.kivy_state_obj = False
+
+    def set_navbar_for_composer(self):
+        """Clearing toolbar data when composer open"""
+        self.root.ids.toolbar.left_action_items = [
+            ['arrow-left', lambda x: self.back_press()]]
+        self.root.ids.toolbar.right_action_items = [
+            ['refresh',
+             lambda x: self.root.ids.id_create.children[1].reset_composer()],
+            ['send',
+             lambda x: self.root.ids.id_create.children[1].send(self)]]
+
     def set_identicon(self, text):
         """Show identicon in address spinner"""
         img = identiconGeneration.generate(text)